Exposure attachment for photographic-printing machines.



B. N. KERR.

EXPOSURE ATTAUHMENT FOR rno'roemrmo PRINTING momma.

APPLIUATIOH FILED HOV. 23,1908. 7 952,334. Patented Mar. 15, 1910.

4 SHEETS-SHEET 1.

ATTORNEYS B. N. KERR.

EXPOSURE ATTACHMENT FOB PHOTOGBAPHIG PRINTING MACHINES.

APPLICATION FILED NOV. 23,1908.

Patented Mar. 15, 1910.

4 SHEETS-SHEET 2.

El INVENTOH ZrzzeaiJ/Jferr WITNESSES A TTOBNE Y8 wmzw s alum-M cu, PNOYO-u- MIS. wasnuaruu n c Patented Mar. 15,1910.

APPLICATION FILED NOV. 23,1908. 952,334.

4 SHEETS-SHEET 3.

WITNESSES a Q m w m m u E. N. KERR.

EXPOSURE ATTACHMENT FDR PHOTOGRAPHIG PRINTING MACHINES.

APPLIUATION FILED NOV. 23,1908

Patented Mar. 15, 1910.

W/TNESSES A TTORNEYS mm 0 GRAHAM cu wommwamm. ram, 9. B

UNITED sures rgcrnntr orrrcn.

ERNEST NORMAN KERR, OF ROCK ISLAND, ILLINOIS.

EXPOSURE ATTACHMENT FOR PHOTOGRAPHI-PBINTING MACHINES.

Application filed November 23, 1908.

Specification of Letters Patent.

Patented Mar. 15, 1910.

Serial No. 463,953.

To all whom it may concern:

Be it known that I, ERNEST N. KERR, a citizen of the United States, and a resident of Rock Island, in the county of Rock Island and State of Illinois, have invented a new and Improved Exposure Attachment for Photographic-Printin Machines, of which the following is a tn 1, clear, and exact description.

My invention relates to photographic printing machines, my more particular purpose benig to enable the operator to adjust the time of exposure, incidental to the photographic printing, with a high degree ov accuracy.

My invention further relates to mechanism for enabling the machine to automatically cut off the light and thus end the exposure of the paper or other article being printed.

My invention relates still further to various details for improving generally the chi ciency of printing machines used in photography and the like.

Reference is to be had to the accompany ing drawings forming a part of this specification, in which similar characters of reference indicate corresponding parts in all the figures.

Figure 1 1s a fragmentary front elevation of the complete machine, the parts occupying their normal position and the twopart. door being closed upon the paper to be held in place and printed; Fig. 2 is a vertical sect-ion upon the line 2-2 of Fig. 1, looking in the direction of the arrow, and showing various details of the door and shutter mechanism; Fig. 3 is a fragmentary elevation partly broken away, and showing the shutter which is moved automatically for the purpose of exposing the film and of ending the exposure, the view further showing a train of gearing used in connection with a revoluble fan for timing the exposnre; Fig. 4 is a fragmentary section upon the line 44 of Fig. 3, looking in the direction of the arrow and showing certain parts closely associated with the release of the shutter for the purpose of allowing it. to he raised in order to make the exposure; Fig. 5 is a side elevation, showing the machine as it. appears with the two-part door in its uppermost position, the machine being now ready to receive the sensitive paper to be printed; Figs. 6, 7 and 8 are diagrams otherwise similar to Fig. 5, and show the f board 13.

parts as they appear with the two-part door moved successively into different positions; and Fig. 9 is an enlarged detail, showing in section a bolt slidably mounted upon a portion of the two-part door for the purpose of engaging a roller and thus enabling the latter to control the partial turning of a shaft at intervals.

A casing 10 having generally the form of a box, is provided with an opening 11 to facilitate the entrance of light thereinto. Mounted within the casing 10 and inclined obliquely is a reflector 12 supported upon a. The casing 10 is provided with a drawer 14 for the purpose of storing a quantity of sensitive papers. A rack 16, inclined slightly in relation to the casing, is provided with slots 17 for the purpose of supporting a number of revoluble fans 18, '19, when not in use. These fans are separately used for the purpose of retarding, by their rotation, the time of exposure, the principle being that the larger the fan the more slowly it is adapted to revolve and consequently the longer will be the exposure on a given application of power to the propulsion of the fan. The casing 10 is provided with a vertical partition 20. The fans 18, 19, when mounted in position, appear as indicated at 18 in Figs. 1 and 3. Each fan is mounted upon a pintle 21, the same being supported at one of its ends by a revoluble shaft 22 and engaged by a dog 23 carried by this shaft.

Mounted within a sub-frame 21 of metal is a train of earing 25 in which the revolulole shaft 22 1S included. A larger shaft 26 is mounted in the top of the sub-frame 24 and extending directly throu h this shaft is an arm 27, a portion of whic projects outside of the casing. The arm 27 carries a button 29 and connected to the latter is a tensile spring 30. The lower end of this spring engages a fastening 31 which is secured directly to the casing. Loosely mounted upon the shaft 26 is a ratchet. wheel 32 and engaging the latter isa pawl 33, this pawl being pressed upon by a spring 34. This pawl and spring are adapted to enable the rotation of the shaft 26 to trans niit power through the train of gearing 25 to the revoluble fans. The shaft 26 is provided with a reduced portion 35 carrying a dog 36. Disposed immediately adjacent to the dog 36 is a substantially L-shaped arm 37 provided with an end 38 (see Fig. 4) which is adapted to engage a leaf spring 39,

this leaf spring being provided for the urpose with a hole 40 into which the em 38 neatly fits. The leaf spring is mounted in a slot 40 and may be pressed slightly inwardthat is, to the right according to Fig. 4by the action of the dog 36.

Mounted upon the casing 10 are bearings 41, 42 (see Fig. 3) and supported by these bearings is a rocking shaft 43. Encircling this shaft is a sleeve 44 adapted to turn partially. Mounted upon one end of the shaft 43 is a collar 4-5, and the L-shaped arm 37 above mentioned extends diametrically through the collar 45 and the adjacent end of the shaft l3. A spiral spring all is socured directly to the shaft 43, and is wound. partially around the same, being connected with a shutter 47 having a rim 4? whereby it is strengthene Another spiral spring 46* is connected with the shaft 43 and is also secured by a fastening 46 to the casing 10. The shutter 4,-7 provided with an opening .18. A latch 49 (see Fi 2) is supported upon a rod 50 and is so gisposed that when the shutter 4T swings downwardly the opening 48 will he brought substantially into registry with the position of the latch 49, thereby allowing this latch to catch upon the rim 4? so as to secure the shutter. A leaf spring 51 is mounted upon the rod 50 and tends to hold the latch it) in proper position for this purpose.

An open frame 52 of substantially rectangular form, is secured upon the casing and is provided with a slot 52 through which the rod 50 extends. A dog 53 having substantially the form of a thumb piece is connected rigidly with the rod 50, and when under pressure of the thumb may be used for slightly tilting this rod so as to release the shutter 47. The dog 53 is provided with a beveled face 54,. A spring 55 engages the point 56 of the framework and also engages the dog 53.

Reinovably mounted within the frame 52 is another frame 57 having substantially a rectangular form and provided with an opening 58,. The frame 57 is removable so that any desired number of such frames may be used interchangeably, each having a difierent size opening 58 to fit the negative. This arrangement does away with a supporting glass for a negative smaller than the opening. This arrangement also. excludes the entrance of dust which might otherwise cause extra work afterward. A glass plate 59. rest-s within the frame 57 which is of proper form to receive it, as will be understood from Fig. 2.

Mounted upon the frame 52 are bearings 60 which support a shaft 61. This shaft is encircled by spiral S1- risgs $2, which are connected together by a collar 64. The spiral springs 62, 63 are connected with fiat rs 65 each beveled at its outer or free end,

as will be understood from Fig. 1.

Another flat bar 66 is fastened to the bars 65, and extends toward the arm 27. The bars (55 are further connected together by a flat bar (36.

At 67 is a plate provided with a. cushion (58 of cloth, or similar material, for the purpose of engaging the paper to be printed. A leaf spring (39 is mounted upon the bar we and is provided with a portion 70 bent slightly outward for the purpose of engaging the beveled face 54 of the dog 53. The plate 67 is mounted upon a bar 71 having substantially an L shape in cross section, this bar being bent. upwardly at its ends and journaled upon pivot pins 72 carried by the bars (35. A plate 73 is pivotally mounted upon two links H so as to have a slight rocking play relatively to these links which are journaled directly upon the shaft 61. The plates 64", 73 together constitute a twopart door which is held in position by pressure of the bars (55 and parts immediately associated therewith, the plates (57, 73 being, to some extent, independent of each other, however, as will be understood from Fig. 5. \Vhen the plates (37, T3 are closed down, as indicated in Figs. 1 and 3, they have the of feet of a continuous pad.

Slidably mounted within one end of the bar (56 (see right of Fig. l) is a. sliding bolt 75, and engaging this bolt is a leaf spring 76. The bolt 7 has generally the form indicated in Fig. 9 and rests in a slot 66" adapted to receive it. The bolt 75 is provided with a beveled face titl and also with a limiting stop, 66. This bolt is adapted to press inwardly (that is, downwardly accord ing to Figs. 5 and 9) whenever the beveled face 66 is nu'ived. to the right according to these views, so as to engage and pass underneath a roller 83 carried by the arm 27.

Mounted rigidly upon the bar 66 is an arm 77 and carried b i the latter is a button 78 having a beveled face 78, this button and a pawl 79 being mounted rigidly upon opposite ends of a. pin 80 which is journaled in the arm 77 and free to turn relatively to the same. A plate 81, secured in position by screws 82 (see Fig. 1), holds the sliding bolt '(5 in position, thus keeping it in alinement with the general position of the button 7 8. Mounted within a slot 83 (see Fig. 1) is a stationary pin 84 which is sometimes engaged by the pawl 79, and when this occurs the pin 84, to some extent, controls motions of the button 78.,

For convenience I designate the bars 65, 66, 66* as a door holder, its purpose being normally to hold the two-part door temporarily closed. When all parts of the machine are in normal positionthat is when the machine is idles-the twoepart door is closed and is held closed by the door holder, the shutter 47 being also. closed and held by the latch 49.

The casing above the frame 52 is provided and allowing the latter to return to its with a glazed opening 18 and above the mirror 12 with a glazed opening 19.

The operation of my device is as follows: Supposing the parts to be in their normal positions. the operator places his thumb upon the dog .33, pulling the latter downward slightly. lift and liberating the door holder. lie next raises the door holder to the position indi cated in Fig. 5, this being the extreme position. In doing this, the operator raises the plate 67 into its extreme position at the top, and owing to the tension of the springs 62. (33 (see Fig. 1) the plate 73 (Fig. 5) is raised at. practically the same instant as the plate (37. but is separated from the latter by an angle of perhaps thirty-five degrees. The upward movement of the door holder causes the beveled Face (36 of the bolt 75 to engage the under side of the roller S3. the bolt 75 being free to move downwardly a little owing to the resilience oi the lea l spring i engaging it (see Fig. '1) readily passes the roller 83. although the arm '27 occupies the limit of its travel. in one direction and is stationary. position indicated in Fig. It. The operator opens the drawer it and takes therefrom a piece of stock 13 which he places against the glass plate 59. He next grasps the plate (37 and swings the door holder downwardly so as to close the door. In doing this. the bolt 75 engages the roller 83 and, being new unable to pass underneath the roller because the beveled face (36 slants in the wrong (11- i rection for this purpose. the arm 27 is turned. the roller 83 simply rolling against the edge of the bolt 75 and the adjacent edge of the plate 81. which is [lush with the same. As the door holder descends farther (see Fig.

,tt) the button 78. under pressure of the roller 83, as the roller moves from between it and the plate 81. turns into such position that the beveled face 7 8* lodges directly against the plate 81. this taking place when the parts occupy the positions indicated in Fig. 6. That is to say, as the roller 83 moves from between the button T8 and the plate 81. the button T8 is pulled against the plate 81 by the spring 78 and as the roller 83 returns, it must. pass upon the button T8. The downward movement of the door holder being continued still farther. so that the door holder reaches almost: its extreme lowermost position. indicated in Fig. 7. the pawl T9 engages the stationary pin S t (compare Figs. 1 and 7) and when the movement of the door holder is finally completed. as indicated in Fig. 8. the pawl pletely by the pin sion of the spring associated with it, turns slightly in a clockwise direction, cated in Fig. 8, thereby rel msing the arm 27 The button TR now occupies the T9. having passed eom- 84-, is now free to turn and consequently the button 78, under tenas indii thus releasing the leaf spring a as shown more particularly in 3 ment with the dog 33.

normal position. The release of the arm 1T takes place at practically the sam instant that the leaf spring till clicks into engago The rocking movement of the arm ".c in causing the, roller 53 to descend turns the dog it: (see Fig. 3) and thus causes the L'shaped arm 3? to be raised. as will be understood from Figs. "2 and this movementbeing jueparatory to enabling the arm to serve as a limiting stop for the shutter 4T which. however. does not move at this instant. This rocking movement of the arm QT. in thus turning the dog Elt'w and raising the arm 37. causes the end (see Fig. l-l to first bend the leaf spring Stl slightly baclt and then pass into the hole tO. The dog 3t? having already moved away from the leaf spring tit). the firm engagement of the end 239 with this leaf spring prevents the collar ll) from turning. and t'tlllStl[tltllll V prevents the arm 3T from being restored innnediately at its normal position. The arm 37 being thus out of the way ot the shutter 4T (see Fig. 3). and this shutter being under tension at the spring it"). is ready to tly up as soon as released at its bottom from the latch li \i'hen. therefore. the door holder (see Fig. 2} is in its lo\\'crniost position. so that the end Ttl ol' the lea ll spring ill acluatcs thc dog 53. the rod St) is tilted slightly. and the latch sli thereupon liberates the shutter lT which. l lies up into the position indicated in Fig. '2. The light is thus admitted through the apertures 11. and the printii'ig paper resting upon the glass in) (which may be a negative or analogous men'ihcrl. and its exposure is thus eonnncncwi. The teat spring 51 allows the latch l? to pass the latch 4-0 in closing.

.lctcrring now to Figs. 2. ii and i. it will be noted that the particular rocking more ment of the arm I incidental to the descent of the roller 83 in teusioning the spring 3t) in effect winds the motor shown at the lett of Fig. 3. and that as soon as the roller Fill at the bottom 01' its stroltc is released the spring lit begin to contract and that the motor gradually runs down as the roller 8 rises to its normal position. The release ol' this roller is cllectcd as will be understood from Figs. 7. in. at practically the same in stant that the spring til engages the dog 5 3. Fig. h. At arried by the door this instant the dog 6) holder having engaged and passed by the stationary pin Si. is free to turn.

and conse :piently the button TS is likewise tree to turn. and therefore as soon as the dog Til is released the arm 2T. by turning the button 78 is set trcina indicated in Fig. H. The arm :27. in being restored to its normal position. moves shiwly. for the reason that it can travel no faster than is commensurate with the action of the t 'ain of gearing l5 and the lt tl l'tO 

